Originally Posted by Pyros

It probably depends on the level of gear, but I'd say tanking heroics without lotp/mangle/survival of the fittest/heart of the wild would be really painful. Your threat generation would be simply too low, so unless you know you'll run them with a paladin(for salv), you probably won't be able to tank heroics unless you respec, at least I wouldn't want to try it. If it's full guild's heroics tho, you could probably explain to your guildmates that you're not generating as much as usual tanks, and manage to do just fine. It's not impossible, but it's pretty much like having a fury war tanking, if people don't know you, they won't take you to tank, even if you're an awesome player and have shiny epics.

For offtanking, it depends on what you mean by that. If you mean tanking trash, and maybe an add on a boss, should be possible. If you mean offtanking the boss for aggro switch or secondary tank attacks(hateful strike for example), I'd say it's a bad idea. Again, the lack of lotp/mangle for threat, and heart of the wild/survival of the fittest for mitigation would probably hurt quite a lot.

While it is possible, you should probably try to choose early what you'll focus on, feral tanks are very good for a lot of situations, but in my experience, much easier to find, than resto druids. And again from my experience, resto druids are really awesome for maintank healing so while they're both good, because ferals are usually easier to find, I'd advise going resto. If you have some time and do dailies every now and then, you can easily respec on weekends or whenever you don't raid, to do heroics and whatnot, and spec back. I usually do some dailies everyday, and respec feral when I feel like doing the daily heroic, or during weekends if I want to farm.